The Duelist Kingdom arc has the biggest examples. The one episode where Kaiba's in that cliff side house and the two guys barge in, pointing their fingers at him, and then when Tristan and Bakura were sneaking around the castle to get Mokuba out of the dungeon. Tristan ends up punching Bakura in the gut and playing Frisbee with the Millennium Ring, which lands in the forest, never to be seen until the Battle City arc.